Looks like Snap (where many of the authors of this paper work at) are heavily investing (or already invested) in R&D for advancing AR and pose estimation with papers like this.
Not the first time I've seen them publish these papers but I think we'll see more from them which will tell us about their next features or future products.
project page?
no code no data no demos
How do such papers even get published? If they intend to keep everything a secret then why even write a paper in the first place?